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  1. PO
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    <p>Ok I got it working. thanks to LordNeckbeard suggestion to use image2pipe. I had to use jpg encoding instead of <a href="https://ffmpeg.org/trac/ffmpeg/ticket/1272">png because image2pipe with png doesn't work on my verision of ffmpeg</a>. The first script is essentially the same as your question's code except I implemented a simple image creation that just creates images going from black to red. I also added some code to time the execution.</p> <p><strong>serial execution</strong></p> <pre><code>import subprocess, Image fps, duration = 24, 100 for i in range(fps * duration): im = Image.new("RGB", (300, 300), (i, 1, 1)) im.save("%07d.jpg" % i) subprocess.call(["ffmpeg","-y","-r",str(fps),"-i", "%07d.jpg","-vcodec","mpeg4", "-qscale","5", "-r", str(fps), "video.avi"]) </code></pre> <p><strong>parallel execution (with no images saved to disk)</strong></p> <pre><code>import Image from subprocess import Popen, PIPE fps, duration = 24, 100 p = Popen(['ffmpeg', '-y', '-f', 'image2pipe', '-vcodec', 'mjpeg', '-r', '24', '-i', '-', '-vcodec', 'mpeg4', '-qscale', '5', '-r', '24', 'video.avi'], stdin=PIPE) for i in range(fps * duration): im = Image.new("RGB", (300, 300), (i, 1, 1)) im.save(p.stdin, 'JPEG') p.stdin.close() p.wait() </code></pre> <p>the results are interesting, I ran each script 3 times to compare performance: <strong>serial:</strong></p> <pre><code>12.9062321186 12.8965060711 12.9360799789 </code></pre> <p><strong>parallel:</strong> </p> <pre><code>8.67797684669 8.57139396667 8.38926696777 </code></pre> <p>So it seems the parallel version is faster about 1.5 times faster.</p>
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    1. POCan you "stream" images to ffmpeg to construct a video, instead of saving them to disk?
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    1. USMarwan Alsabbagh
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    1. POCan you "stream" images to ffmpeg to construct a video, instead of saving them to disk?
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      1. VTUpMod
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    1. COBrilliant! I've tested this out and it works marvelously.
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      1. USBrandon
    2. COFor anyone who stumbles upon this in the future, replacing 'mjpeg' with 'png' and 'JPEG' with 'PNG' worked for me to use png.
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